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1. AtCoder:Solved Problems.
2. Code Jam - Google's Coding Competitions:Solved Problems.
3. CodeChef:Solved Problems.
4. CodeForces:Solved Problems.
5. CSES:Solved Problems.
6. HackerEarth:Solved Problems.
7. Neps Academy:Solved Problems.
8. PKU JudgeOnline (POJ):Solved Problems.
9. Sphere Online Judge (SPOJ):Solved Problems.
10. URI Online Judge (URI):Solved Problems.
11. URI Online Judge (URI):SQL Solutions.
12. UVA Online Judge (UVA):Solved Problems.

1. Deque:Implementations.
2. Graph:Implementations
3. HashTable:Implementations.
4. Linked List:Implementations.
5. Priority Queue:Implementations.
6. Queue:Implementations.
7. Stack:Implementations.
8. Tree:Implementations.
9. Union Find (Disjoint Set):Implementations.

1. Backtracking:
   • Array Combinations
   • Array Permutations
   • DiceRolls
   • DiceSum
   • String Permutations
   • N Queens Problem
   • PrintBinary
   • Sudoku
2. Graph Algorithms:
   • Bellman-Ford
   • Dijkstra's Algorithm (Adjacent List and Matrix)
   • Dijkstra's Algorithm (SET)
   • Dijkstra's Algorithm (Priority Queue)
   • Kruskal's Algorithm
   • Prim's Algorithm (Adjacent Matrix)
   • Prim's Algorithm (Adjacent List)
   • A* (Star) Algorithm
3. Dynamic Programming:
   • Coin Change Problem
   • Kadane Algorithm
   • Knapsack 1/0 Problem
   • Unbounded Knapsack Problem
   • Subset Sum Problem
   • Longest Common Substring
   • Longest Common Subsequence
   • Longest Palindromic Subsequence
4. Greedy Algorithms:
   • Coin Change Problem
5. String Algorithms:
   • String Matching (Naive Solution)
   • LPS (Longest Prefix Which Is Also A Suffix)
   • Knuth-Morris-Pratt Algorithm (KMP)
6. Sort Algorithms:Implementations
   • Bubble Sort
   • Bubble Sort (Recursive)
   • Selection Sort
   • Selection Sort (Recursive)
   • Insertion Sort
   • Insertion Sort (Recursive)
   • Merge Sort
   • Quick Sort
   • ShellSort
   • Shuffle Sort
7. Search Algorithms:Implementations
   • Binary Search
   • Linear Search
8. Techniques:
   • Two Pointers
   • Square Root Decomposition